Function normalizeParsedProblemDetails

http/unstable_problem_details.ts:249–289

(
  raw: unknown,
)

}

function normalizeParsedProblemDetails(
  raw: unknown,
): Record<string, unknown> {
  if (typeof raw !== "object" || raw === null || Array.isArray(raw)) {
    throw new TypeError(
      `Cannot parse Problem Details: expected a JSON object, but got ${
        raw === null ? "null" : Array.isArray(raw) ? "an array" : typeof raw
      }`,
    );
  }

  const result: Record<string, unknown> = {};
  const source = raw as Record<string, unknown>;

  // RFC 9457 §3.1: ignore standard members whose value type does not match.
  for (const key in source) {
    if (!Object.hasOwn(source, key)) continue;
    const value = source[key];
    switch (key) {
      case "type":
        if (typeof value === "string") result.type = value;
        break;
      case "status":
        if (Number.isInteger(value)) result.status = value;
        break;
      case "title":
        if (typeof value === "string") result.title = value;
        break;
      case "detail":
        if (typeof value === "string") result.detail = value;
        break;
      case "instance":
        if (typeof value === "string") result.instance = value;
        break;
      default:
        result[key] = value;
    }
  }

  return result;
}

/**
 * Parses a plain JSON value into a {@linkcode ProblemDetails}.